Scratch3.0初始化加载七牛云上的sbs文件的方法

import PropTypes from 'prop-types';
import React from 'react';
import {connect} from 'react-redux';
import {injectIntl, intlShape} from 'react-intl';

import analytics from '../lib/analytics';
import log from '../lib/log';
import {LoadingStates, onLoadedProject, onProjectUploadStarted} from '../reducers/project-state';

import {openLoadingProject,closeLoadingProject} from '../reducers/modals';

/** 获取作品的编号 **/
function getProjectId() {
	if(document.getElementById("projectId")){
		return $("#projectId").val();
	} else {
		alert("sb3-downloader-qiniu.jsx文件提示：页面不存在id属性为projectId的对象!");
		return null;
	}
}

/**
 * 从七牛云加载sb3文件
 */
class SB3DownloaderQiniu extends React.Component {
    constructor (props) {
        super(props);
    }
	
	componentDidMount() { 
		var _this = this;
		
		if(getProjectId()==null){
			return;
		}
	  
		// 作品所在存放地址
		var sb3Path = null;
		$.ajax({
			dataType:"json",
			async:false,
			url:"/project/checkProjectByProjectId",
			data: {id: getProjectId()},
			success:function(res){
				if(res.success==true){
					sb3Path = res.sb3Path;
				}
			}
		});
		
		/**
		 * 必须使用 $(window).on("load",function(){});
		 * 否则页面在未加载完的情况下，有些组件会来不及加载，影响二次文件保存
		 */
		$(window).on("load",function(){
			let reader = new FileReader();
			let request = new XMLHttpRequest();
			request.open('GET', sb3Path, true);
			request.responseType = "blob";
			request.onload = function() {
				if(request.status==404){
					alert("未找到sb3类型的资源文件");
					location.href='/scratch';
				}
				let blobs = request.response
				reader.readAsArrayBuffer(blobs);
				reader.onload = () => _this.props.vm.loadProject(reader.result).then(() => {
					analytics.event({
						category: 'project',
						action: 'Import Project File',
						nonInteraction: true
					});
					_this.props.onLoadingFinished(_this.props.loadingState);
				}).catch(error => {
					log.warn(error);
				});
			}
			request.send();
		});
	    
	}
   
    render () {
        return this.props.children(this.props.className);
    }
}

SB3DownloaderQiniu.propTypes = {
    children: PropTypes.func,
    className: PropTypes.string,
    intl: intlShape.isRequired,
    loadingState: PropTypes.oneOf(LoadingStates),
    onLoadingFinished: PropTypes.func,
    vm: PropTypes.shape({
        loadProject: PropTypes.func
    })
};

SB3DownloaderQiniu.defaultProps = {
    className: ''
};

const mapStateToProps = state => ({
    loadingState: state.scratchGui.projectState.loadingState,
    vm: state.scratchGui.vm
});

const mapDispatchToProps = (dispatch, ownProps) => ({
    onLoadingFinished: loadingState => {
		console.dir("sb3文件加载完毕！");
        dispatch(onLoadedProject(loadingState, ownProps.canSave));
        dispatch(closeLoadingProject());
    }
});

// Allow incoming props to override redux-provided props. Used to mock in tests.
const mergeProps = (stateProps, dispatchProps, ownProps) => Object.assign(
    {}, stateProps, dispatchProps, ownProps
);

export default connect(
    mapStateToProps,
    mapDispatchToProps,
    mergeProps
)(injectIntl(SB3DownloaderQiniu));

<SB3DownloaderQiniu /** 初始化加载文件到项目 **/>
	{(className, loadProject) => (
		<button onClick={loadProject} className={classNames(styles.scratchHide)}></button>
	)}
</SB3DownloaderQiniu>

const url="/static/123.sb3";
        fetch(url,{
            method: 'GET'
        })
        .then(response=>response.blob())
        .then(blob=>{
            const reader=new FileReader();
            reader.onload=()=>this.props.vm.loadProject(reader.result)
            .then(()=>{
                GoogleAnalytics.event({
                    category:'project',
                    action:'Import Project File',
                    nonInteraction:true
                })
            })
            reader.readAsArrayBuffer(blob)
        })
        .catch(error=>{
            alert(`远程加载文件错误！${error}`)
        })

<script>

window.projectUrl="https://steam.nosdn.127.net/885318eb-ad83-44c4-afe3-d3bea0a0d2ab.sb3";

</script>